Malicious PDF — malware analysis report

Static analysis result for SHA-256 72bb36ab0090786d…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 14:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d867fb3dc808553bd2c2cb77074ac1b SHA-1: 3e0f1ba10af6d20182dd2719b2d075f7587bbe7b SHA-256: 72bb36ab0090786ddab873526f566a8e5a4c074c69da4a4d8cda10d88887ea14
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests the PDF is likely a lure for phishing or to download further malicious content. The document body was heavily obfuscated and unreadable, preventing a more detailed analysis of its specific pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9526

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://feedproxy.google.com/~r/sq/ugae/~3/AnJPYMJXbyQ/square?utm_term=donal+logue+in+blade
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e9163392abcc18c4f58efe/1625888307423/46596285056.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f4f9a3860d895b483b7838/1626667427621/operations_management_3rd_edition_kruger_free_download.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f52f69a9adb72803bcee63/1626681193791/is_achondroplasia_a_dominant_or_recessive_trait.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edb805c2b60e0ed5b76771/1626191877917/list_of_nonmetals_on_the_periodic_table.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8227d5c13cc4fededaeeb/1625825917505/similarities_between_essentialism_and_perennialism.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f4775a6167905317e681f9/1626634075062/bobby_vinton_i_love_how_you_love_me.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed4691f9a98d6db3aba380/1626162833382/on_his_blindness_poem_text.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f05fb895008556a283f44a/1626365880311/best_challenges_in_fortnite.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec46.bin
09cf4567432b3730bb939bf7f5555d2481cdc06491dad5a0e7d31ab05504f791
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 17684 bytes
font_01_sfnt_off000119a6.bin
f4e5b6fa655dd8e7e5939ed9907f5459b3dfaf577028f2c208120f3405c761c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 10296 bytes
font_02_sfnt_off000130a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130A5 16792 bytes